Historical Weather in Hillsboro, OR
See 55+ years of weather history for any date in Hillsboro going back to 1970.
Part of Oregon weather history · Oregon temperature records
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Today in Hillsboro Weather HistorySee records, averages, and 55+ years of data for today's date
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Monthly Climate Averages
Historical temperature and precipitation averages for Hillsboro, OR, based on 55+ years of weather data.
Warmest MonthAugustAvg High: 82°F / Low: 54°F
Coldest MonthDecemberAvg High: 47°F / Low: 35°F
Jan
47°/ 35°
💧 7.3"
❄️ 1.1"
Feb
51°/ 36°
💧 6.3"
❄️ 1.5"
Mar
56°/ 38°
💧 5.5"
❄️ 0.8"
Apr
62°/ 41°
💧 4.2"
May
68°/ 46°
💧 3.9"
Jun
74°/ 50°
💧 4.0"
Jul
82°/ 54°
💧 3.1"
Aug
82°/ 54°
💧 4.4"
Sep
76°/ 49°
💧 5.1"
Oct
64°/ 43°
💧 5.7"
Nov
53°/ 39°
💧 7.4"
❄️ 1.6"
Dec
47°/ 35°
💧 8.2"
❄️ 1.7"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Hillsboro, OR Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Avg high Avg low
Hillsboro, OR Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Rain (in) Snow (in)
Hillsboro, OR Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
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Best Time to Visit Hillsboro, OR
Hillsboro, OR has no months that meet our "pleasant" threshold — every season has tradeoffs.
Jan
Feb
Mar
Apr
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Dec
Pleasant (65-82°F, ≤2.5" rain) Mild Less ideal
Hillsboro Temperature Records
- Record High: The hottest temperature ever recorded in Hillsboro, OR is 114°F, set on June 28, 2021.
- Record Low: The coldest temperature ever recorded in Hillsboro, OR is -4°F, set on December 8, 1972.
- Data Coverage: Based on 29 years of data from NOAA weather station: PORTLAND-HILLSBORO AP.
All-Time Record High
114°F
June 28, 2021
All-Time Record Low
-4°F
December 8, 1972
Monthly Temperature Records in Hillsboro
| Month | Record High | Record Low |
|---|---|---|
| January | 67°F(2005) | -1°F(1979) |
| February | 72°F(1986) | 5°F(1989) |
| March | 84°F(2025) | 13°F(1971) |
| April | 90°F(2016) | 25°F(2008) |
| May | 103°F(1983) | 30°F(1985) |
| June | 114°F(2021) | 32°F(1999) |
| July | 108°F(1998) | 39°F(1977) |
| August | 108°F(1977) | 38°F(2008) |
| September | 104°F(1988) | 30°F(1999) |
| October | 93°F(1988) | 20°F(2002) |
| November | 73°F(2010) | 6°F(1985) |
| December | 67°F(1993) | -4°F(1972) |
Hillsboro Snow RecordsSee the top 10 snowiest days ever recorded
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Holiday Weather in Hillsboro
Weather Analysis & Trends
RecordsHottest Temperatures Ever Recorded in Every US StateAll 50 state record highs ranked, including Oregon.Severe WeatherTornado Season 2026: Forecasts & What to ExpectAn EF5 already, and the peak still ahead.Climate ForecastEl Niño 2026: What Every US Region Should Expect85% likely by late 2026. Region-by-region impact analysis.